does the guitar have a model # on headstock?Can you describe what it looks like(color,woodgrain,sunburst finish etc.)Is the neck attached with bolts or fitted and glued.how many pick-ups?tremolo arm?I contacted Cservice@washburn.com.,and they told me all about mine,but I did give them the model #(mine was an A-20V)made in 1983 and listed for $749 then.The serial should be on the back of headstock;they might be able to tell you based on that and a fairly good description.
The model # was on the black part that covers the neck bolt.Hope that helps.